Home / 13,128.15-18,117.28-7,160.14

Finding the Fourth Proportional to 13,128.15, 18,117.28 and 7,160.14

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Solution

The fourth proportional to 13,128.15, 18,117.28 and 7,160.14 is: 9,881.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,128.15 : 18,117.28 = 7,160.14 : x
  2. Step 2: Convert to fraction form
    13,128.15/18,117.28 = 7,160.14/x
  3. Step 3: Cross multiply
    13,128.15x = 18,117.28 × 7,160.14
  4. Step 4: Simplify right side
    13,128.15x = 129,722,261.22
  5. Step 5: Solve for x
    x = 129,722,261.22/13,128.15
  6. Step 6: Final answer
    x = 9,881.23

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.